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3 <br /> GROUNDWATER MONITORING WELLS <br /> Groundwater monitoring wells consisting of two-inch diameter, exterior, flush threaded <br /> NSF approved rigid 40 well casing and well screen, were installed at the site The locations of the <br /> wells are illustrated m Figure 2. Stabilized groundwater was encountered in the borings at a <br /> depth of approximately 26 feet below grade <br /> The wells were installed using hollow stem auger equipment Each well was completed <br /> %ith a filter packed well screen, bentonite seal, and a sanitary seal, which consisted of <br /> bentomte/cement grout slurry Each well was developed using surge block and bailing methods <br /> For details see the Well Logs m Appendix B. <br /> SOIL SAMPLE ANALYSIS <br /> Four soil samples from each soil bormg/moniton ng well were analyzed for BTEX and <br /> TPHg using EPA methods 8020/8015 The soil sample at a depth of 30 feet was also tested for the <br /> oxygenates compounds Sample analysis was conducted by Sherwood Laboratory, a state certified <br /> laboratory, located in Hilmar, California Sample identities and analytical results for each <br /> constituent detected are presented in Table 2. Certified analytical reports and completed Cham-of-- <br /> Custody documents are presented in Appendix C. <br /> Table 2 <br /> Soil Analyses for BTEX-TPH-g <br /> 23569 South Santa Fe Road <br /> Riverbank, California <br /> January 23, 1998 <br /> • <br /> Boring No. B-1 <br /> Benzene Toluene Ethel(ug/kg) Total(ug/kg) <br /> Depth (feet) (ug& (i�, /�kg) Benzene Xylene TPH-g(rng/k ) <br /> 20 5000 233000 61600 323000 4140 <br /> 25 4090 9660 1770 10300 131 <br /> 30 583 675 80 401 6 <br /> Soil Sample Analyses <br /> November 24, 25 1998 <br /> MW-2 <br /> 15 793 1660 580 7360 135 <br /> 20 183000 1280000 405000 2080000 28100 <br /> 30 2200 1330 116 911 13 <br /> 35 6 20 7 32 ND<1 <br /> MW-3 <br /> 15 5 3 ND<3 9 ND<1 <br /> 20 3530 4580 372 2150 31 <br /> 30 29600 221000 84400 439000 608 <br /> 35 7 33 10 54 ND<1 <br /> MW-4 <br /> 15 ND<3 ND<3 ND<3 ND<3 ND<1 <br /> 20 128 164 23 120 3 <br /> 30 29600 496 144 638 8 <br />